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use crate::{
encoding::{headers::CSeq, request::Request, response::Response, Message},
transport::Transport,
};
use anyhow::{anyhow, Result};
use std::{
collections::HashMap,
sync::atomic::{AtomicU32, Ordering},
};
use tokio::sync::{
mpsc::{self, channel},
RwLock,
};
pub struct TransactionUser<T> {
transport: T,
sequence: AtomicU32,
pending_requests: RwLock<HashMap<CSeq, mpsc::Sender<Response>>>,
}
impl<T: Transport> TransactionUser<T> {
pub fn new(transport: T) -> Self {
Self {
sequence: 0.into(),
pending_requests: Default::default(),
transport,
}
}
pub async fn process_incoming(&self) -> Result<Request> {
loop {
let mesg = self.transport.recv().await?;
match mesg {
Message::Request(req) => break Ok(req),
Message::Response(resp) => {
let cseq = resp
.headers
.get()
.ok_or(anyhow!("response cseq missing"))??;
self.pending_requests
.write()
.await
.get_mut(&cseq)
.ok_or(anyhow!("message was not requested"))?
.send(resp)
.await?;
}
}
}
}
pub async fn transact(&self, mut request: Request) -> Result<mpsc::Receiver<Response>> {
let seq = self.sequence.fetch_add(1, Ordering::Relaxed);
let cseq = CSeq(seq, request.method);
request.headers.insert(cseq);
let (tx, rx) = channel(4);
self.transport.send(Message::Request(request)).await?;
self.pending_requests.write().await.insert(cseq, tx);
Ok(rx)
}
}
|
